Two more Ohio Democrats have filed paperwork to run for statewide office in 2018: former Cincinnati mayoral candidate Rob Richardson Jr. for treasurer and ex-U.S. Rep. Zack Space for state auditor.

Richardson, a labor attorney, came in third during the May 2 Cincinnati mayoral primary with slightly more than 20 percent of the vote. It was his first run for political office, though he served nine years on the University of Cincinnati board of trustees - including one year as chair...